UDS Request / Response Playground

Compose a UDS request, send it to the simulated ECU, and read back a realistic response — including positive responses, negative responses with NRCs, and decoded payloads.

Compose request

Service (SID)

Parameters (hex bytes)

Format: 22 <DID:2>

Quick presets

ECU response

[ bus idle — send a request to begin ]

Note: this is an educational simulator. Responses are deterministic approximations of typical ECU behavior — real ECUs may vary based on session, security state, and vendor implementation.